In a two-digit number the tens digit is four less than the units digit. Seven times the tens digit plus five times the units dig
it is equal to 56. Find the digits.
1 answer:
Good morning ☕️
Answer:
<h2>37</h2><h2 />
Step-by-step explanation:
Let our number be “ xy ”
the tens digit is four less than the units digit means y-4=x
Seven times the tens digit plus five times the units digit is equal to 56 means
7x+5y=56
now we have to solve the system:
y-4=x (1)
7x+5y=56 (2)
(1) ⇒ y=4+x
Then we substitute y by 4+x into the second equation like this:
7x+5(x+4)=56
⇔ 7x+5(x+4)=56
⇔ 12x+20=56
⇔ x = 3
now using equation (1) we get : y=3+4 = 7
:)
You might be interested in
If BD=DC that means triangle CDB is isosceles triangle and the measure of angles ∡CDB and ∡BCD is the same
∡CDB=∡BCD=70°The angles ∡ADB and ∡CDB are adjacent and suplementary angles
It means
∡ADB + ∡CDB = 180°
∡ADB = 180° - ∡CDB
∡ADB = 180° - 70°
<u>∡ADB = 110°</u>
Step-by-step explanation:
3х + 2y = 14
3х - 2y = 10
6x=24
x=4
3×4+2y=14
12+2y=14
2y=14-12
2y=2
y=1
Answer:
it would be (10)- (4)
Step-by-step explanation: